Re: [Solved] A result was returned by the statement, when none was expected.

Hello all.

I'm using PostgreSQL 7.2.2, with the latest JDBC driver, JDK 1.4.1, under
linux.

In my database, I have several functions defined, and I use them to
insert & update rows in the database. Here is an example.
create function insert_artist (varchar, int) returns bigint as '
insert into artist (name, genre_loid)
values ($1, $2);
select currval(\'loid_seq\');'
language 'sql';
create function update_artist (varchar, bigint, bigint) returns integer as
'
update artist
set name = $1, genre_loid = $2
where loid = $3;
select 1;'
language 'sql';

The insert_artist function returns the last value assigned by a sequence,
and update_artist simply returns the integer 1.

When executed from psql with: select x_artist(...); all is as expected.
When I execute it from Java via:
Statement statement = connection.createStatement();
int result = statement.executeUpdate("select x_artist(...)");
the row is updated or inserted, as is the case, but I get the follwoing
exception.
A result was returned by the statement, when none was expected.
at org.postgresql.jdbc2.Statement.executeUpdate(Statement.java:75)
at com.silverfields.dbAccess.DBObject.save(DBObject.java:205)

What have I done incorrectly? Both functions are defined to return a
single value, and Statement.executeUpdate(String) returns a single value.

I finally figured this out. For anyone that might want to know, what I
nneded was this:
if (statement.execute(sqlStatementString)) {
//ResultSet Available
ResultSet rs = statement.getResultSet();
rs.next();
result = rs.getInt(1);
}else{
//Update count or no result available
result = statement.getUpdateCount();
}

For my functions, a ResultSet is returned, which does NOT make sence as
the functions were declared to return type integer. Oh well.

On Sun, 3 Nov 2002 17:20:18 -0500
Timothy Reaves <treaves(at)silverfields(dot)com> wrote:

> Hello all.
>
> I'm using PostgreSQL 7.2.2, with the latest JDBC driver, JDK
> 1.4.1, under
> linux.
>
> In my database, I have several functions defined, and I use them
> to
> insert & update rows in the database. Here is an example.
> create function insert_artist (varchar, int) returns bigint as '
> insert into artist (name, genre_loid)
> values ($1, $2);
> select currval(\'loid_seq\');'
> language 'sql';
> create function update_artist (varchar, bigint, bigint) returns integer
> as'
> update artist
> set name = $1, genre_loid = $2
> where loid = $3;
> select 1;'
> language 'sql';
>
> The insert_artist function returns the last value assigned by a
> sequence,
> and update_artist simply returns the integer 1.
>
> When executed from psql with: select x_artist(...); all is as
> expected.
> When I execute it from Java via:
> Statement statement = connection.createStatement();
> int result = statement.executeUpdate("select x_artist(...)");
> the row is updated or inserted, as is the case, but I get the follwoing
> exception.
> A result was returned by the statement, when none was expected.
> at org.postgresql.jdbc2.Statement.executeUpdate(Statement.java:75)
> at com.silverfields.dbAccess.DBObject.save(DBObject.java:205)
>
>
> What have I done incorrectly? Both functions are defined to
> return a
> single value, and Statement.executeUpdate(String) returns a single
> value.
>
> ---------------------------(end of broadcast)---------------------------
> TIP 5: Have you checked our extensive FAQ?
>
> http://www.postgresql.org/users-lounge/docs/faq.html

Your problem is that you are calling executeUpdate while passing in a
select statement. Even though the select statement only returns 1 row of
1 column, it is still a ResultSet while the driver does not expect one to
be returned because you claimed to be doing an update.

Kris Jurka

On Sun, 3 Nov 2002, Timothy Reaves wrote:

> I finally figured this out. For anyone that might want to know, what I
> nneded was this:
> if (statement.execute(sqlStatementString)) {
> //ResultSet Available
> ResultSet rs = statement.getResultSet();
> rs.next();
> result = rs.getInt(1);
> }else{
> //Update count or no result available
> result = statement.getUpdateCount();
> }
>
> For my functions, a ResultSet is returned, which does NOT make sence as
> the functions were declared to return type integer. Oh well.
>
>
> On Sun, 3 Nov 2002 17:20:18 -0500
> Timothy Reaves <treaves(at)silverfields(dot)com> wrote:
>
> > Hello all.
> >
> > I'm using PostgreSQL 7.2.2, with the latest JDBC driver, JDK
> > 1.4.1, under
> > linux.
> >
> > In my database, I have several functions defined, and I use them
> > to
> > insert & update rows in the database. Here is an example.
> > create function insert_artist (varchar, int) returns bigint as '
> > insert into artist (name, genre_loid)
> > values ($1, $2);
> > select currval(\'loid_seq\');'
> > language 'sql';
> > create function update_artist (varchar, bigint, bigint) returns integer
> > as'
> > update artist
> > set name = $1, genre_loid = $2
> > where loid = $3;
> > select 1;'
> > language 'sql';
> >
> > The insert_artist function returns the last value assigned by a
> > sequence,
> > and update_artist simply returns the integer 1.
> >
> > When executed from psql with: select x_artist(...); all is as
> > expected.
> > When I execute it from Java via:
> > Statement statement = connection.createStatement();
> > int result = statement.executeUpdate("select x_artist(...)");
> > the row is updated or inserted, as is the case, but I get the follwoing
> > exception.
> > A result was returned by the statement, when none was expected.
> > at org.postgresql.jdbc2.Statement.executeUpdate(Statement.java:75)
> > at com.silverfields.dbAccess.DBObject.save(DBObject.java:205)
> >
> >
> > What have I done incorrectly? Both functions are defined to
> > return a
> > single value, and Statement.executeUpdate(String) returns a single
> > value.
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 5: Have you checked our extensive FAQ?
> >
> > http://www.postgresql.org/users-lounge/docs/faq.html
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo(at)postgresql(dot)org
>

Timothy,

What actually happens is that the select returns the values of the
functions.

So simply if you have a select foo() where foo returns 1 then you will
get the following a column named foo, and a value of 1 for it,
regardless of what foo does internally.

The result set is from the select, not the function.

Dave
On Sun, 2002-11-03 at 21:04, Timothy Reaves wrote:
> I finally figured this out. For anyone that might want to know, what I
> nneded was this:
> if (statement.execute(sqlStatementString)) {
> //ResultSet Available
> ResultSet rs = statement.getResultSet();
> rs.next();
> result = rs.getInt(1);
> }else{
> //Update count or no result available
> result = statement.getUpdateCount();
> }
>
> For my functions, a ResultSet is returned, which does NOT make sence as
> the functions were declared to return type integer. Oh well.
>
>
> On Sun, 3 Nov 2002 17:20:18 -0500
> Timothy Reaves <treaves(at)silverfields(dot)com> wrote:
>
> > Hello all.
> >
> > I'm using PostgreSQL 7.2.2, with the latest JDBC driver, JDK
> > 1.4.1, under
> > linux.
> >
> > In my database, I have several functions defined, and I use them
> > to
> > insert & update rows in the database. Here is an example.
> > create function insert_artist (varchar, int) returns bigint as '
> > insert into artist (name, genre_loid)
> > values ($1, $2);
> > select currval(\'loid_seq\');'
> > language 'sql';
> > create function update_artist (varchar, bigint, bigint) returns integer
> > as'
> > update artist
> > set name = $1, genre_loid = $2
> > where loid = $3;
> > select 1;'
> > language 'sql';
> >
> > The insert_artist function returns the last value assigned by a
> > sequence,
> > and update_artist simply returns the integer 1.
> >
> > When executed from psql with: select x_artist(...); all is as
> > expected.
> > When I execute it from Java via:
> > Statement statement = connection.createStatement();
> > int result = statement.executeUpdate("select x_artist(...)");
> > the row is updated or inserted, as is the case, but I get the follwoing
> > exception.
> > A result was returned by the statement, when none was expected.
> > at org.postgresql.jdbc2.Statement.executeUpdate(Statement.java:75)
> > at com.silverfields.dbAccess.DBObject.save(DBObject.java:205)
> >
> >
> > What have I done incorrectly? Both functions are defined to
> > return a
> > single value, and Statement.executeUpdate(String) returns a single
> > value.
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 5: Have you checked our extensive FAQ?
> >
> > http://www.postgresql.org/users-lounge/docs/faq.html
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo(at)postgresql(dot)org
>
>